firmware/target/arm/iriver/ifp7xx/lcd-ifp7xx.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Alan Korr
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 #include "config.h"
  20
  21 #include "kernel.h"
  22 #include "lcd.h"
  23 #include "system.h"
  24
  25 /*** definitions ***/
  26
  27 #define LCD_SET_LOWER_COLUMN_ADDRESS              ((char)0x00)
  28 #define LCD_SET_HIGHER_COLUMN_ADDRESS             ((char)0x10)
  29 #define LCD_SET_INTERNAL_REGULATOR_RESISTOR_RATIO ((char)0x20)
  30 #define LCD_SET_POWER_CONTROL_REGISTER            ((char)0x28)
  31 #define LCD_SET_DISPLAY_START_LINE                ((char)0x40)
  32 #define LCD_SET_CONTRAST_CONTROL_REGISTER         ((char)0x81)
  33 #define LCD_SET_SEGMENT_REMAP                     ((char)0xA0)
  34 #define LCD_SET_LCD_BIAS                          ((char)0xA2)
  35 #define LCD_SET_ENTIRE_DISPLAY_OFF                ((char)0xA4)
  36 #define LCD_SET_ENTIRE_DISPLAY_ON                 ((char)0xA5)
  37 #define LCD_SET_NORMAL_DISPLAY                    ((char)0xA6)
  38 #define LCD_SET_REVERSE_DISPLAY                   ((char)0xA7)
  39 #define LCD_SET_MULTIPLEX_RATIO                   ((char)0xA8)
  40 #define LCD_SET_BIAS_TC_OSC                       ((char)0xA9)
  41 #define LCD_SET_1OVER4_BIAS_RATIO                 ((char)0xAA)
  42 #define LCD_SET_INDICATOR_OFF                     ((char)0xAC)
  43 #define LCD_SET_INDICATOR_ON                      ((char)0xAD)
  44 #define LCD_SET_DISPLAY_OFF                       ((char)0xAE)
  45 #define LCD_SET_DISPLAY_ON                        ((char)0xAF)
  46 #define LCD_SET_PAGE_ADDRESS                      ((char)0xB0)
  47 #define LCD_SET_COM_OUTPUT_SCAN_DIRECTION         ((char)0xC0)
  48 #define LCD_SET_TOTAL_FRAME_PHASES                ((char)0xD2)
  49 #define LCD_SET_DISPLAY_OFFSET                    ((char)0xD3)
  50 #define LCD_SET_READ_MODIFY_WRITE_MODE            ((char)0xE0)
  51 #define LCD_SOFTWARE_RESET                        ((char)0xE2)
  52 #define LCD_NOP                                   ((char)0xE3)
  53 #define LCD_SET_END_OF_READ_MODIFY_WRITE_MODE     ((char)0xEE)
  54
  55 /* LCD command codes */
  56 #define LCD_CNTL_RESET          0xe2    /* Software reset */
  57 #define LCD_CNTL_POWER          0x2f    /* Power control */
  58 #define LCD_CNTL_CONTRAST       0x81    /* Contrast */
  59 #define LCD_CNTL_OUTSCAN        0xc8    /* Output scan direction */
  60 #define LCD_CNTL_SEGREMAP       0xa1    /* Segment remap */
  61 #define LCD_CNTL_DISPON         0xaf    /* Display on */
  62
  63 #define LCD_CNTL_PAGE           0xb0    /* Page address */
  64 #define LCD_CNTL_HIGHCOL        0x10    /* Upper column address */
  65 #define LCD_CNTL_LOWCOL         0x00    /* Lower column address */
  66
  67 /*** driver routines ***/
  68
  69 void lcd_write_command(int cmd)
  70 {
  71     while ((LCDSTAT & 3) != 3);
  72     LCDCMD = cmd;
  73 }
  74
  75 void lcd_write_data( const unsigned char* data, int count )
  76 {
  77     int i;
  78     for (i=0; i < count; i++) {
  79         while ((LCDSTAT & 3) != 3);
  80         LCDDATA = data[i];
  81     }
  82 }
  83
  84 /*** hardware configuration ***/
  85
  86 int lcd_default_contrast(void)
  87 {
  88     return 45;
  89 }
  90
  91 void lcd_set_contrast(int val)
  92 {
  93     lcd_write_command(LCD_CNTL_CONTRAST);
  94     lcd_write_command(val);
  95 }
  96
  97 void lcd_set_invert_display(bool yesno)
  98 {
  99     if (yesno)
 100         lcd_write_command(LCD_SET_REVERSE_DISPLAY);
 101     else
 102         lcd_write_command(LCD_SET_NORMAL_DISPLAY);
 103 }
 104
 105 /* turn the display upside down (call lcd_update() afterwards) */
 106 void lcd_set_flip(bool yesno)
 107 {
 108     if (yesno)
 109     {
 110         lcd_write_command(LCD_SET_SEGMENT_REMAP);
 111         lcd_write_command(LCD_SET_COM_OUTPUT_SCAN_DIRECTION);
 112     }
 113     else
 114     {
 115         lcd_write_command(LCD_SET_SEGMENT_REMAP | 0x01);
 116         lcd_write_command(LCD_SET_COM_OUTPUT_SCAN_DIRECTION | 0x08);
 117     }
 118 }
 119
 120 void lcd_init_device(void)
 121 {
 122     LCDREG10 = 0xf;
 123     LCDREG04 = 0x4084;
 124
 125     /* inits like the original firmware */
 126     lcd_write_command(LCD_SOFTWARE_RESET);
 127     lcd_write_command(LCD_SET_INTERNAL_REGULATOR_RESISTOR_RATIO + 4);
 128     lcd_write_command(LCD_SET_LCD_BIAS);
 129     lcd_write_command(LCD_SET_POWER_CONTROL_REGISTER + 7);
 130                /* power control register: op-amp=1, regulator=1, booster=1 */
 131     lcd_write_command(LCD_SET_DISPLAY_ON);
 132     lcd_write_command(LCD_SET_NORMAL_DISPLAY);
 133     lcd_set_flip(false);
 134     lcd_write_command(LCD_SET_DISPLAY_START_LINE + 0);
 135     lcd_set_contrast(lcd_default_contrast());
 136     lcd_write_command(LCD_SET_PAGE_ADDRESS);
 137     lcd_write_command(LCD_SET_LOWER_COLUMN_ADDRESS + 0);
 138     lcd_write_command(LCD_SET_HIGHER_COLUMN_ADDRESS + 0);
 139
 140     lcd_clear_display();
 141     lcd_update();
 142 }
 143
 144 /*** Update functions ***/
 145
 146 /* Performance function that works with an external buffer
 147    note that by and bheight are in 8-pixel units! */
 148 void lcd_blit(const unsigned char* data, int x, int by, int width,
 149               int bheight, int stride)
 150 {
 151     /* Copy display bitmap to hardware */
 152     while (bheight--)
 153     {
 154         lcd_write_command (LCD_CNTL_PAGE | (by++ & 0xf));
 155         lcd_write_command (LCD_CNTL_HIGHCOL | (((x+4)>>4) & 0xf));
 156         lcd_write_command (LCD_CNTL_LOWCOL | ((x+4) & 0xf));
 157
 158         lcd_write_data(data, width);
 159         data += stride;
 160     }
 161 }
 162
 163
 164 /* Update the display.
 165    This must be called after all other LCD functions that change the display. */
 166 void lcd_update(void) ICODE_ATTR;
 167 void lcd_update(void)
 168 {
 169     int y;
 170
 171     /* Copy display bitmap to hardware */
 172     for (y = 0; y < LCD_FBHEIGHT; y++)
 173     {
 174         lcd_write_command (LCD_CNTL_PAGE | (y & 0xf));
 175         lcd_write_command (LCD_CNTL_HIGHCOL);
 176         lcd_write_command (LCD_CNTL_LOWCOL | 4);
 177
 178         lcd_write_data (lcd_framebuffer[y], LCD_WIDTH);
 179     }
 180 }
 181
 182 /* Update a fraction of the display. */
 183 void lcd_update_rect(int, int, int, int) ICODE_ATTR;
 184 void lcd_update_rect(int x, int y, int width, int height)
 185 {
 186     int ymax;
 187
 188     /* The Y coordinates have to work on even 8 pixel rows */
 189     ymax = (y + height-1) >> 3;
 190     y >>= 3;
 191
 192     if(x + width > LCD_WIDTH)
 193         width = LCD_WIDTH - x;
 194     if (width <= 0)
 195         return; /* nothing left to do, 0 is harmful to lcd_write_data() */
 196     if(ymax >= LCD_FBHEIGHT)
 197         ymax = LCD_FBHEIGHT-1;
 198
 199     /* Copy specified rectange bitmap to hardware */
 200     for (; y <= ymax; y++)
 201     {
 202         lcd_write_command (LCD_CNTL_PAGE | (y & 0xf));
 203         lcd_write_command (LCD_CNTL_HIGHCOL | (((x+4) >> 4) & 0xf));
 204         lcd_write_command (LCD_CNTL_LOWCOL | ((x+4) & 0xf));
 205
 206         lcd_write_data (&lcd_framebuffer[y][x], width);
 207     }
 208 }